Chain saw



FIG. 1 is a right side perspective view taken from the front of a chain saw according to the present invention;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a bottom elevational view thereof;

FIG. 8 is a right side perspective view taken from the front of a second embodiment thereof;

FIG. 9 is a right side view of a second embodiment thereof;

FIG. 10 is a left side view of a second embodiment thereof;

FIG. 11 is a top plan view of a second embodiment thereof;

FIG. 12 is a front view of a second embodiment thereof;

FIG. 13 is a rear view of a second embodiment thereof; and,

FIG. 14 is a bottom elevational view of a second embodiment thereof. 

The ornamental design for a chain saw, as shown and described. 